Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B1370 01: Device Ignition 1 Circuit Short to BatteryDTC B1370 04: Device Ignition 1 Circuit Open Circuit
DTC B1380 01: Device Ignition ACCESSORY Circuit Short to Battery
DTC B1380 04: Device Ignition ACCESSORY Circuit Open Circuit
DTC B1441 01: Device Ignition OFF, RUN and CRANK Circuit Short to Battery
DTC B1441 06: Device Ignition OFF, RUN and CRANK Circuit Short to Ground or Open
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Device Ignition 1 Circuit | B1370 04 | B1370 04 | B1370 01 | -- |
Device Ignition ACCESSORY Circuit | B1380 04 | B1380 04 | B1380 01 | -- |
Device Ignition OFF, RUN and CRANK Circuit | B1441 06 | B1441 06 | B1441 01 | -- |
Conditions for Running the DTC
B1370 01
Ignition switch is in the OFF or ACC positions.
B1370 04
Ignition switch is in the START position.
B1380 01, B1380 04, B1441 01, B1441 06
The system voltage is 9-18 volts.
Conditions for Setting the DTC
B1370 01, B1380 01, B1441 01
BCM detects a short to voltage.
B1370 04, B1380 04
The BCM detects an open.
B1441 06
The BCM detects an open or short to ground.
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Power Mode Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed with the corresponding ignition key position. The PMM Power Mode Parameters table below illustrates the correct state of these input parameters (circuits) in correspondence to the ignition switch position. The circuits which the individual parameters are related to are in parentheses.
Ignition Switch Position | Current Power Mode | Run Relay Command (Off/Run Crank Voltage Circuit) | Ignition Switch Accessory Signal (Accessory Voltage Circuit) | Run/Crank Relay Command (Ignition 1 Voltage Circuit |
|---|---|---|---|---|
Off Key Out | Off | Off | Inactive | OFF |
Off Key IN | Off | Off | Inactive | OFF |
Accessory | Accessory | Off | Active | OFF |
Run | Run | ON | Active | ON |
Start | Crank Request | OFF | Inactive | ON |
| ⇒ | If any parameters are incorrect in any key position, refer to the Circuit/System Testing or Component Testing. |
Circuit/System Testing
- Inspect the Ignition Switch B+ fuse for an open.
- Ignition OFF, disconnect the harness connector at the ignition switch.
- Ignition ON, verify that a test lamp illuminates between the ignition switch B+ circuit terminal 2 and ground.
- Ignition OFF, disconnect X2 and X4 harness connectors at the BCM.
- Ignition key out, test for less than 1-volt between the circuit terminals listed below and ground:
- Test for less than 1 ohm between the BCM terminals and the ignition switch terminals listed below:
- If all circuits test normal, replace the BCM.
Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
| ⇒ | If the fuse is open, test the circuits listed below for a short to ground: |
| • | Ignition switch B+ |
| • | Accessory voltage |
| • | Off/Run crank voltage |
| • | Ignition 1 voltage |
| ⇒ | If all circuits test normal, replace the BCM. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. |
Important: The ignition switch component test must be preformed before proceeding with this test to verify the integrity of the switch.
| • | Accessory voltage terminal C8 |
| • | Ignition 1 voltage terminal D3 |
| • | Off/Run/Crank voltage terminal 56 |
| ⇒ | If greater than the specified range, test the circuit for a short to voltage. |
| • | Accessory voltage terminal C8 and 4 |
| • | Ignition 1 voltage terminal D3 and 3 |
| • | Off/Run/Crank voltage terminal 56 and 5 |
| ⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
Component Testing
Ignition Switch
Using the Resistance Test below, check the resistance between the pins of the ignition switch listed in each switch position listed.
| ⇒ | If any reading is other than specified, replace the ignition switch. |
Ignition Switch Position | Terminals 2 and 3 | Terminals 2 and 5 | Terminals 2 and 6 | Terminals 5 and 6 |
|---|---|---|---|---|
Off Key Out | Infinite | Infinite | Infinite | Infinite |
Off Key IN | Infinite | < 5.0 ohms | Infinite | Infinite |
Accessory | < 5.0 ohms | Infinite | Infinite | Infinite |
Run | < 5.0 ohms | Infinite | Infinite | < 5.0 ohms |
Start | Infinite | Infinite | Infinite | 1275-1325 ohms |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
